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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6758c2edaed2f0280f7738c6c4a46a0758af0a6b6ec3e7d9419adddc13bdfbb8' 
  AND token = 'yIbpLBzrSLbCTXYJAbi8rFlodc1Eqkeq/ZR5h9IbN5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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