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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c0a201a23c4d991fe56b38dc4a8245f5b786d5d0c3be18a4248f4887a1ceaf' 
  AND token = 'QW7YPjujkFWb0ABds6ZfRP7nteOgN7sRjSe10QPLSZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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