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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29060497fb26a673931589294c9f9bd520c05c5423c66235517da4db069c5aec' 
  AND token = 'A/0NlmgAH73y9nITIK/RhsFWIXsdmSdBn262oLhtAeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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