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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '240d3835e0ff4a145ae5d6109fd8bd0f100a496e0133798e1febf9b86ba526d0' 
  AND token = 'uJWpFFeBblBF+rWg0ClZ+cB8kJfdjBYhbVx7fCG2isU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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