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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5a6e34c00a92fd1cc860cecb3bbab8cf0543088d27b33d530de5bf9259328e' 
  AND token = '6AOa4ak7Zi4pZrcz9E0tlOv/tHOH+BU7jNI3EBdcDLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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