SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2c7180695cb36f835ac66eff596334d7af629aaaac1170b23b8f219bef69a0' 
  AND token = '+l+Fqi7w8gsjJ2kJ7vdLW3s/CiCQuneBhmmQ5bwf0xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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