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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062f71956736684364ddf52f72fe7250813a7a7b23a962a7f664c4208555d06a' 
  AND token = 'B2RB1Jv50rEwHITzV1tNojghV67yHLeHWJ5jfmnvTb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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