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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b38ac9db1df7f3f76c918292d4377a86e15d38da7d764727dbd1a7aabda8b6e' 
  AND token = 'ErYpLgcgzfh8ddCq+YqsHDbDkzTtyqBND2Lh+o6ensQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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