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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a394ef573824ece0eb831d726c800a2d300b7d37cddd15b1bf88adece07d61a9' 
  AND token = '5qH+wUEwdQ4HwHc3aFE+c9NuWrfXlA/3wXknXexWIKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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