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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c243716603e2a927bf78002b284e6f6ff79521601bddbab7b697f0ab4c5f3552' 
  AND token = 'WCSPS4QLisNZ9cULBHFceH5D2F7SDX/oqsh5mNyLE0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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