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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db586b71a45792465f2ba31d4b16de81e923383c56dd67ffe7671a231f476c6' 
  AND token = 'N6aoF7LD/qhogyqGleEIHbE/nxYDj4lJZioWYoT8Hqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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