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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e8784ecb3c3a59d48e2a5bf93eba212eda6f14d87ab1d2d1b07d309f9aee61b' 
  AND token = 'bad7WhoFX6wH+ygHLyvl9hbXAoqOLqeom4OT+GGclCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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