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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '980fc2e062dc652ede64f263cd8eaa528e4b2479057906aaac6a26de3dad9ff0' 
  AND token = 'Xi/DkLBty0D3kKDC3sX0pzfSb/sbQA8h/YjjL/dE884=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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