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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74dddf76298b549a158e97903f2e4f43ce2d3c1010a370e332be0e6f7c5ad7de' 
  AND token = 'KNSwVkZq2NQFonq9n6JoGXad/hSHo3ZvP+7q+CrinA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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