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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e87e09bae8f76542929dbb803e61e27f9586f969ad94263b01180c8f64fbd24f' 
  AND token = 'KjJdy1nbFffFCTs03+/TXtAN2hD41oVQIVl+Mty9KO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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