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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbcb7176f5ac6098031b3213e65e96034b28378b907768d2ce4b23f0e56a7f33' 
  AND token = 'Dz0f4AlO85p6HARZSgXhPpfGL9ei6i+IRkhlHkTFXCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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