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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b041fc866ad2c43b13ff3b2e9db88d0f1e5f2b981cb75ac5db0c0c7003394950' 
  AND token = 's3uuYO9aaGlaieAy2UoQf8bI/VZFXy86fbmiArKuhpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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