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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff62f371b109f90cff1c3e2c532aee16985912f675b1e79670c29aad99e8769' 
  AND token = 'lCHsU+SNQmOa9WX5+v4Nl2G8psbBrewJft3Q26AqD1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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