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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a5840ede129266e449bd72af7263a9db82387e5223ce880f6db11f63598c78' 
  AND token = 'rNTxqe3qTQ4ruCWjOF2qrIxLnzd5xjKQJok2qRwJ+tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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