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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee595aa80dda84740340fc073153fe51837efd4232a8221139ea0df3c18061d' 
  AND token = 'AkDkHdxYDR6sJOz1saKQLay7GIHhaFqdoosl/crwxQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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