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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '865e15d2f6274fc44cee746e53302ac87e855723fc19c1257df7021a706212d5' 
  AND token = 'KfqoWzvZt9fejZ9/YMXfkytH87XcelUAWF8BL7/JCGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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