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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5c31f8b6d4bcbc59d83110a4996112e351b0a338f9c8b11f80763a28bc8de3' 
  AND token = 'cSW75B4mteXBb2VPjrXWoVXUpiyzEaklHWTi5s/km8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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