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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9092be906f4d2d72546b04d3fef7616cceb0701f1a2e17c1b92a79df29848a3c' 
  AND token = 'dGYyU8P+5h9ABT2/lp7vbmD0dGafa4lLa2g0XC1Rj98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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