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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9243fe3ab95db2c64fd4c02300190e42c2ee45522d2ca55f0b8dff097e81ea1d' 
  AND token = 'qFiOr9Qt22AYgpq8gvX8VZ5/ev0Vhzl+OCuWFhUqgZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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