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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc39ab21f96e23e1f752c0d55366acf775999fc85b4f845fce2ed3b35160545f' 
  AND token = '1MteiRXunvwu+AK6UUk1TQkXckemHm56G99IITPY+Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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