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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f14b101c412d9102949dea42c38d42568b61eb1ce4c29a4ec31753e1ca8b6e' 
  AND token = 'nlic3cAe4LA0s37uH9AO+6MRabm6QfxZROg+9VcyUBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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