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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1cee9d9a353cecdc810e06612973ab60b560a11ad6fc3d13a425c62e4ded0a6' 
  AND token = '5WQJZAyyy3vYM694nsg+NIcdm/bginifC2Mcn/IBmhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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