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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '733b4900513694a8f155a9cc904b8654c517bbce1f3201fd403b0538be061dd4' 
  AND token = 'Y7C1EM8pYeeNX4NwpSFORk2HPtltF/ClJaku5Bd3fbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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