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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55bcccfe8213fd74f5dc204badcac7aa46b3a099bf94d5b32ee10faa854bf3c1' 
  AND token = 'ghmZOyrF64aaIar8er9VqVEbNUBJatSq50Z5k0YyWb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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