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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c542984fb5604af2ddee9fdb5f2f08b423286b02cc8e4947c2606a3e41d6c6' 
  AND token = 'OEZeOUbpI8EdyypsFrV8gYrm6gY/x2YIlhxL3QZ597I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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