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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a6d23a96230516202c45bc832959e9592885ff10d791311a5c81691d2db096' 
  AND token = '8fXfFfjOHFkyxywLoHKfhg1Hmj4TrXy1YLw15FlBEKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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