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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0666a84122c0b786604d80301151231d0b4f4c326f614f547d5c4154f1a3a2f1' 
  AND token = 'MapQvLWwuNqTyQoyTQtf0rTYjVs1baGS4ptTjYFapC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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