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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c41aecdce4ff73a001e3893f2ce372d5a41da3d91a964d8bd2e702d63b8aab7' 
  AND token = 'KBGHyBXtAxtIZRNAcQ6fPb5qkaDTuMGwx78MFL0V+Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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