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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5625a12de04e180153e384f3327e7116b9be07355cd26273712e8cebec31267' 
  AND token = 'h0q1PMfZEwv5xOoJbSiIrE1UoArteQM42VFHUazqt2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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