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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e7ba04f279f9b69e60157082e593146f62cc5c8b69fed26aacf9a1106a21b8f' 
  AND token = 'GK2FWKjBUWYmJOUztOAnDHDX0082MWmYX6vDmFcf2sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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