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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd94642e30d1cffec9477b787e6477fddb2f804ab528331afaf53d13ef20c97' 
  AND token = 'y+uZ8hTTTGrlOTfxtpWHMaGK99LFVeJg7FgEKReNQRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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