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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b047e422183ab302d0d2fce6d3d68ba7977ab461a1c422f95373a98201b068e3' 
  AND token = 'wK7p/J0scHuIe/xe6edMhNvaICuJdKzYm37zkh4Qark=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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