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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3bd71c7b0e6c765d027c8c3629601916351317031c7c222b90731ae38d3dff3' 
  AND token = 'MykHIxUCabNFgpCe7WnTPkwLHIXK+JIC54pmagbKq5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}