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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8843802b1a36fc7193ec4440f518dc619d3d35530d79159cd54e0e7a3187c1' 
  AND token = 'NBla8o0mqTcgjVXmiJR/nj1C9OJ1eyLkKQCDNZeFc2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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