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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c80a8f95b875eba80bc3b3423f39de22de77ee025d34c76e7bc02f480ca4d9' 
  AND token = 'KJ9Uv4SJNereArQtGLC17B5Hpt6somv9uroZCfoG/qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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