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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d336aad66b73416a7a3ae24f034dd2e1ba9763392d9b4b8268aaa997ac3693' 
  AND token = '2DZLM6BB/zhsC7E/0xGLpi2WkV2C1eR6W7f1xppVEak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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