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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d4b6613d32359c9aba6eb980bc3b0d592e983ddbe714c079cc420572aa7b44' 
  AND token = 'Tn5N6LMF9LUPUuhJ7BkR8BAhE1tsfRvGf8R8+DPHCiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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