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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '281fefee31cdbe83ae9d942b955da67bb6b0e980f9217acf1af12c00ec646672' 
  AND token = 'ld2Xy+8jWr9gNPzP3hDc/zpCdRWOjD2G02CdjkzI7rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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