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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fadea89ab3b2914b19c8f564c5a9072ddbd62c027438a0318e2f7f0179d49bc1' 
  AND token = 'ZTZyF9ww/tFWA7k5EEcLeEeTqNIUILdJcP/NfBtN+Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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