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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e10c8468f9c9f8ab7c659929671da1bed6b3b30ad943b10534e553866413d7c' 
  AND token = 'ok8wCkM96gdCazcBPiIN8eG77yCDm1N2BNH1zj2tsrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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