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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74764ba180f2624831f7e301e38d9c24d47baabee25e0628600b6dfebe748e04' 
  AND token = '3QUp0AI+hg1hB0werhXZ4/bnATnkT7wCFLSoqhjF0N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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