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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a06c7d1958911125be645ea71930e10a298226b6ced241dd710c4d06c7d5bd' 
  AND token = 'pA9RmxhvhJPcDE41Ey3s53tKcRp0prKvZRJj8zETXXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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