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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '538a03adaa0a52312d6f8a2f8fe020c9a825377210842adbebde30a3005fa4fb' 
  AND token = '315Q4fNydRLiGbvVnXH9Amx8xfUf75p/I26bn2MZ0tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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