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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae31fdade17e53d1777011f1754437bef21a6b8ac1e230117c3a3a3a5eef7bf' 
  AND token = 'JMk5bkx21y0Jnft15iJtTnELDYJS6ve2A55O3zIoRJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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