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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa515916a36a428b5051f88e5ce6f9231f1efae7d5574b2bff445d5e07b10d9' 
  AND token = 'v9n3R3aawkqMkp5HgD/PXd7H6mgafWQT2VLaQCM+ZAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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