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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0ffe0ea8fcfe7fe88601f05f6badf406b96ba4de3654e0f844e73597d20100c' 
  AND token = '9SKuUbgPf9PbCOfbdOPZqWl91icfIiwXMQeiCfBExrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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