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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231ba8c49b52eacdec4d4261162983887aa5e9b5215445ad29e1465812b708ae' 
  AND token = '7M5oPV5rVA1VE3+cdwdN6Ut94Fkv1IeWA82K76Ys65w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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