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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10a17bc9135a680f6868bfed486ebc5de361c435eaad5b1640cf1ca5d7600a6' 
  AND token = '2V9SlABvVfbzVx5BWKEMBSjqDyqC/6q6HygaoqyMWjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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