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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e4bdd40bd5286b7b28410fb7447345b22cdb95ee1c32541bed3d32656e9db8' 
  AND token = 'Twmy1ZhCwcOCHi1Y9sbTLU6FmRPAUd5iKwIaK/LFE6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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