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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd01ba3285ed2ba29ffadbe4f5fdb73443aa5bdc09a5262993fe3f05fb64aa4b6' 
  AND token = 'rRPix0Kzl+d0mMnXjfY5rKMkbvkjqgbU7QWz9Et4+v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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