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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd92ae484a52ae1efa118f0e6b3412d14d73ab4890ef04a9281f0f846c37d44' 
  AND token = 'oyEtK3J27H7hO8HcnddNXY5rNvWOZrOtuKoj+vGWTIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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