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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76827a225dd31fddcce9a41e4345903a725d1c73c24316d6bcf480a61a4050c8' 
  AND token = 'lBArDw3GeOftmwR/1tZ6OGvmDg4iePpwlEn1yrXsDEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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