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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8fbd904e287f5f14a3c15e5f5dafba08ff6ff52f27e5b2310f896eac333c74' 
  AND token = 'XdChF7rodoOEy2dOzu+bvhAkEoOO8DIabEtxfXkFxuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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