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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb06e2eea8eda489b4b268b92c49bc269c4725bea7a706609cf27514ccb8edd' 
  AND token = 'xf+4AnB8/bgek5snzc2UXiF2PWjQa9J5Na9cndlhRO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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